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Hya David

I really enjoyed reading your posts...beautifully written..

I was a bit surprised by your pulsing video and went off to try it just for fun. I don't get why you would want to knock yourself backwards though or what benefit there is to that? I don't move position but tanden and other things will adjust to keep me stable in the same position.

I'm guessing it's the wall that should be moving...be difficult to do though ^^

All the best

Lee